My mra brain (no contrast) said everything was fine. my doctor said no aneurysms but the report says no medium or large aneurysms why does the report say no small ones too? could i have a small one and they just didnt mention it on the report?

An "MRA without contrast" may "miss" detection of smaller size aneurysms , but the risk of adverse consequences from small aneurysms if present, is significantly less. Ask the physician who ordered the MRA if a repeat with contrast is necessary.

The focus upon larger aneurysms is crucial, as rupture occurs far more frequently if aneurysm is larger than 0.9 cm. Tiny aneurysms are likely inconsequential unless expanding, and would tend to result in no clinical consequences. Since you appear worried, suggest you discuss outcomes with your doctor and radiologist who interpreted the images.